In re the size of the bombs ...
There was a rumor that the IAF used GBU 39's (250-lb guided bomb) in Gaza a few years ago, but Israeli officials said no, they didn't.
F-15E's are certified for them. (2006 ish) Not sure if other platforms are certified or not.
Did the UK get on board the small bomb band wagon, or the French? I seem to recall that either the French or Italians wanted to use the smaller bombs ... but don't have any idea.
If this is "not for public discussion" please advise.